CVE-2026-43205 (GCVE-0-2026-43205)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-05-11 22:20
VLAI
Title
dpaa2-switch: validate num_ifs to prevent out-of-bounds write
Summary
In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: validate num_ifs to prevent out-of-bounds write The driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes() but never validates it against DPSW_MAX_IF (64). This value controls iteration in dpaa2_switch_fdb_get_flood_cfg(), which writes port indices into the fixed-size cfg->if_id[DPSW_MAX_IF] array. When firmware reports num_ifs >= 64, the loop can write past the array bounds. Add a bound check for num_ifs in dpaa2_switch_init(). dpaa2_switch_fdb_get_flood_cfg() appends the control interface (port num_ifs) after all matched ports. When num_ifs == DPSW_MAX_IF and all ports match the flood filter, the loop fills all 64 slots and the control interface write overflows by one entry. The check uses >= because num_ifs == DPSW_MAX_IF is also functionally broken. build_if_id_bitmap() silently drops any ID >= 64: if (id[i] < DPSW_MAX_IF) bmap[id[i] / 64] |= ...
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < a26dda3bae469c8e4e1b1993ad33dafa32d0fc28 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < a3034a8d56174dd6464c46823438f25797910a8d (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < b690635d4719214892855b79ce018d4b1672ac96 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < 8b841fd529db9faf8bc678d429d4bf4e98b10900 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < 89764cf44544e943230f5e03b8c40a90da26537c (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < c18493f750208eb4ff1198fc5a02786b8b2d70a6 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < 8a5752c6dcc085a3bfc78589925182e4e98468c5 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpaa2-switch: validate num_ifs to prevent out-of-bounds write\n\nThe driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes()\nbut never validates it against DPSW_MAX_IF (64). This value controls\niteration in dpaa2_switch_fdb_get_flood_cfg(), which writes port indices\ninto the fixed-size cfg-\u003eif_id[DPSW_MAX_IF] array. When firmware reports\nnum_ifs \u003e= 64, the loop can write past the array bounds.\n\nAdd a bound check for num_ifs in dpaa2_switch_init().\n\ndpaa2_switch_fdb_get_flood_cfg() appends the control interface (port\nnum_ifs) after all matched ports. When num_ifs == DPSW_MAX_IF and all\nports match the flood filter, the loop fills all 64 slots and the control\ninterface write overflows by one entry.\n\nThe check uses \u003e= because num_ifs == DPSW_MAX_IF is also functionally\nbroken.\n\nbuild_if_id_bitmap() silently drops any ID \u003e= 64:\n      if (id[i] \u003c DPSW_MAX_IF)\n          bmap[id[i] / 64] |= ..."
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: dpaa2-switch: validar num_ifs para prevenir una escritura fuera de l\u00edmites El controlador obtiene sw_attr.num_ifs del firmware a trav\u00e9s de dpsw_get_attributes() pero nunca lo valida contra DPSW_MAX_IF (64). Este valor controla la iteraci\u00f3n en dpaa2_switch_fdb_get_flood_cfg(), que escribe \u00edndices de puerto en el array de tama\u00f1o fijo cfg  -\u003e  if_id[DPSW_MAX_IF]. Cuando el firmware informa num_ifs mayor o igual que 64, el bucle puede escribir m\u00e1s all\u00e1 de los l\u00edmites del array. A\u00f1adir una comprobaci\u00f3n de l\u00edmites para num_ifs en dpaa2_switch_init(). dpaa2_switch_fdb_get_flood_cfg() a\u00f1ade la interfaz de control (puerto num_ifs) despu\u00e9s de todos los puertos coincidentes. Cuando num_ifs == DPSW_MAX_IF y todos los puertos coinciden con el filtro de inundaci\u00f3n, el bucle llena las 64 ranuras y la escritura de la interfaz de control desborda en una entrada. La comprobaci\u00f3n usa \u003e= porque num_ifs == DPSW_MAX_IF tambi\u00e9n est\u00e1 funcionalmente roto. build_if_id_bitmap() descarta silenciosamente cualquier ID mayor o igual que 64: si (id[i] \u003c DPSW_MAX_IF) bmap[id[i] / 64] |= ..."
          }
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        "id": "CVE-2026-43205",
        "lastModified": "2026-11-11T20:10:00.273",
        "metrics": {
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                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
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        "published": "2026-05-06T12:16:39.747",
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            "url": "https://git.kernel.org/stable/c/a26dda3bae469c8e4e1b1993ad33dafa32d0fc28"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a3034a8d56174dd6464c46823438f25797910a8d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b690635d4719214892855b79ce018d4b1672ac96"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c18493f750208eb4ff1198fc5a02786b8b2d70a6"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-05T20:20:01+00:00",
      "cve": "CVE-2026-43205",
      "id": "CVE-2026-43205",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:fixed": "309",
      "product_status:known_not_affected": "199",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel dpaa2-switch: Kernel memory corruption via out-of-bounds write",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43205.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-07T02:20:22Z",
      "cve": "CVE-2026-43205",
      "id": "CVE-2026-43205",
      "initial_release_date": "2026-05-07T02:17:14Z",
      "product_status:known_affected": "530",
      "product_status:known_not_affected": "175",
      "product_status:recommended": "350",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43205",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-43205.json",
      "version": "19"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.